/** * @return string|null */ public function source_language_code() { $lang = $this->post_translations->get_source_lang_from_translation_id($this->translation_id); $lang = $lang['found'] ? $lang : $this->term_translations->get_source_lang_from_translation_id($this->translation_id); $lang = $lang['found'] ? $lang['code'] : $this->select_field('source_language_code'); return $lang; }